import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

@WebServlet("/index")
public class IndexServlet extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        // 返回主页，
        // 得到用户名是啥(session中拿)
        HttpSession session = req.getSession(false);// 不需要创建了,直接获取到
        String username = (String)session.getAttribute("username");
        Integer count = (Integer) session.getAttribute("count");// 获取次数
        count++;

        // 自增后的值写回 session
        session.setAttribute("count", count);

        resp.setContentType("text/html; charset=utf8");
        resp.getWriter().write("<h3>欢迎你！" + username + "这是第" + count + "次访问主页" + "</h3>");
    }
}
